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Title: Ordering ferromagnetic In{sub 1−x}Mn{sub x}As quantum dots

In this work, we present a method to order low temperature (LT) self-assembled ferromagnetic In{sub 1−x}Mn{sub x}As quantum dots (QDs) grown by molecular beam epitaxy (MBE). The ordered In{sub 1−x}Mn{sub x}As QDs were grown on top of a non-magnetic In{sub 0.4}Ga{sub 0.6}As/GaAs(100) QDs multi-layered structure. The modulation of the chemical potential, due to the stacking, provides a nucleation center for the LT In{sub 1−x}Mn{sub x}As QDs. For particular conditions, such as surface morphology and growth conditions, the In{sub 1−x}Mn{sub x}As QDs align along lines like chains. For comparison purposes, we also report the study of QDs grown on plain GaAs(100) substrates. Ferromagnetic behavior was observed for all structures at 2 K.
Authors:
;  [1] ; ;  [2]
  1. Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos 13560-970, SP (Brazil)
  2. Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701 (United States)
Publication Date:
OSTI Identifier:
22261855
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1566; Journal Issue: 1; Conference: ICPS 2012: 31. international conference on the physics of semiconductors, Zurich (Switzerland), 29 Jul - 3 Aug 2012; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ABSORPTION SPECTROSCOPY; GALLIUM ARSENIDES; MOLECULAR BEAM EPITAXY; QUANTUM DOTS; SUBSTRATES; X-RAY SPECTROSCOPY